Adobe Acrobat DC - Make your job easier with Adobe Acrobat DC, the trusted PDF creator. Use Acrobat to convert, edit and sign PDF files at your desk or on the go.
Online Convert - Convert files like images, video, documents, audio and more to other formats with this free and fast online converter.
Zamzar - Free conversion online of many type of documents (images, text, video, audio...
Wondershare PDFelement - All-in-one PDF editor
online2pdf - This Online PDF Converter can convert all your files to PDF but also compress and merge PDF files! Word, Excel, PowerPoint, images and any other kind of document can be easily converted to PDF on Online2PDF.
CometDocs - Free online conversion service. Possible to determine unknown file format too.